Index: /FCKeditor/trunk/_whatsnew.html
===================================================================
--- /FCKeditor/trunk/_whatsnew.html	(revision 1949)
+++ /FCKeditor/trunk/_whatsnew.html	(revision 1950)
@@ -63,4 +63,6 @@
 		<li>[<a target="_blank" href="http://dev.fckeditor.net/ticket/2136">#2136</a>] Fixed JavaScript error in IE 
 			when opening the bullet list properties dialog.</li>
+		<li>[<a target="_blank" href="http://dev.fckeditor.net/ticket/1633">#1633</a>] External styles should no
+			longer interfere with the appearance of the editor and floating panels now.</li>
 	</ul>
 	<h3>
Index: /FCKeditor/trunk/editor/_source/classes/fckeditingarea.js
===================================================================
--- /FCKeditor/trunk/editor/_source/classes/fckeditingarea.js	(revision 1949)
+++ /FCKeditor/trunk/editor/_source/classes/fckeditingarea.js	(revision 1950)
@@ -98,5 +98,5 @@
 
 		oIFrame.frameBorder = 0 ;
-		oIFrame.width = oIFrame.height = '100%' ;
+		oIFrame.style.width = oIFrame.style.height = '100%' ;
 
 		if ( FCK_IS_CUSTOM_DOMAIN && FCKBrowserInfo.IsIE )
Index: /FCKeditor/trunk/editor/_source/classes/fckpanel.js
===================================================================
--- /FCKeditor/trunk/editor/_source/classes/fckpanel.js	(revision 1949)
+++ /FCKeditor/trunk/editor/_source/classes/fckpanel.js	(revision 1950)
@@ -67,9 +67,10 @@
 	{
 		var oIFrame = this._IFrame = this._Window.document.createElement('iframe') ;
+		FCKTools.ResetStyles( oIFrame );
 		oIFrame.src					= 'javascript:void(0)' ;
 		oIFrame.allowTransparency	= true ;
 		oIFrame.frameBorder			= '0' ;
 		oIFrame.scrolling			= 'no' ;
-		oIFrame.width = oIFrame.height = 0 ;
+		oIFrame.style.width = oIFrame.style.height = '0px' ;
 		FCKDomTools.SetElementStyles( oIFrame,
 			{
@@ -280,6 +281,6 @@
 				var iWidth = eMainNode.offsetWidth || eMainNode.firstChild.offsetWidth ;
 				var iHeight = eMainNode.offsetHeight ;
-				me._IFrame.width = iWidth ;
-				me._IFrame.height = iHeight ;
+				me._IFrame.style.width = iWidth + 'px' ;
+				me._IFrame.style.height = iHeight + 'px' ;
 
 			}, 0 ) ;
@@ -306,5 +307,5 @@
 		// It is better to set the sizes to 0, otherwise Firefox would have
 		// rendering problems.
-		this._IFrame.width = this._IFrame.height = 0 ;
+		this._IFrame.style.width = this._IFrame.style.height = '0px' ;
 
 		this._IsOpened = false ;
Index: /FCKeditor/trunk/editor/_source/internals/fck.js
===================================================================
--- /FCKeditor/trunk/editor/_source/internals/fck.js	(revision 1949)
+++ /FCKeditor/trunk/editor/_source/internals/fck.js	(revision 1950)
@@ -1176,2 +1176,22 @@
 	}
 }
+
+/*
+ * #1633 : Protect the editor iframe from external styles.
+ * Notice that we can't use FCKTools.ResetStyles here since FCKTools isn't
+ * loaded yet.
+ */
+(function()
+{
+	var el = window.frameElement ;
+	var width = el.width ;
+	var height = el.height ;
+	if ( /^\d+$/.test( width ) ) width += 'px' ;
+	if ( /^\d+$/.test( height ) ) height += 'px' ;
+	var style = el.style ;
+	style.border = style.padding = style.margin = 0 ;
+	style.backgroundColor = 'transparent';
+	style.backgroundImage = 'none';
+	style.width = width ;
+	style.height = height ;
+})() ;
Index: /FCKeditor/trunk/editor/_source/internals/fckdialog.js
===================================================================
--- /FCKeditor/trunk/editor/_source/internals/fckdialog.js	(revision 1949)
+++ /FCKeditor/trunk/editor/_source/internals/fckdialog.js	(revision 1950)
@@ -76,13 +76,4 @@
 	}
 
-	var resetStyles = function( element )
-	{
-		element.style.cssText = 'margin:0;' +
-			'padding:0;' +
-			'border:0;' +
-			'background-color:transparent;' +
-			'background-image:none;' ;
-	}
-
 	return {
 		/**
@@ -114,5 +105,5 @@
 			// Setup the IFRAME that will hold the dialog.
 			var dialog = topDocument.createElement( 'iframe' ) ;
-			resetStyles( dialog ) ;
+			FCKTools.ResetStyles( dialog ) ;
 			dialog.src = FCKConfig.BasePath + 'fckdialog.html' ;
 
@@ -180,5 +171,5 @@
 			// Setup the DIV that will be used to cover.
 			cover = topDocument.createElement( 'div' ) ;
-			resetStyles( cover ) ;
+			FCKTools.ResetStyles( cover ) ;
 			FCKDomTools.SetElementStyles( cover,
 				{
@@ -196,5 +187,5 @@
 			{
 				var iframe = topDocument.createElement( 'iframe' ) ;
-				resetStyles( iframe ) ;
+				FCKTools.ResetStyles( iframe ) ;
 				iframe.hideFocus = true ;
 				iframe.frameBorder = 0 ;
Index: /FCKeditor/trunk/editor/_source/internals/fcktools.js
===================================================================
--- /FCKeditor/trunk/editor/_source/internals/fcktools.js	(revision 1949)
+++ /FCKeditor/trunk/editor/_source/internals/fcktools.js	(revision 1950)
@@ -739,2 +739,11 @@
 	return "javascript: void(0);" ;		// All other browsers.
 }
+
+FCKTools.ResetStyles = function( element )
+{
+	element.style.cssText = 'margin:0;' +
+		'padding:0;' +
+		'border:0;' +
+		'background-color:transparent;' +
+		'background-image:none;' ;
+}